I assume it makes it relatable to people who are accustomed to seeing kWh on their electric bills.

Bills for thousands of cents.

I also think we should say the moon is 384 Mm instead of 384,000 km. Mega meters are awesome, we should use them more. And the earth sun distance is 150 Gigameters.

That's what the submitter chose as a submission title. The document's title is "Sea Water District Cooling Feasibility Analysis for the State of Hawaii".

If you want to normalize the SI units, you could also replace "many GWh" with "many TJ".